Raise mininum h5py version to 3

setup.py

@@ -9,7 +9,7 @@ setup(
     version="0.1",
     author="",
     author_email="",
-    install_requires=["h5py", "numpy"],
+    install_requires=["h5py>=3", "numpy"],
     classifiers=[
         "Development Status :: 3 - Alpha",
         "Intended Audience :: Science/Research",